THE MUSCLES AND HOW TO USE THEM 



75. A Few Muscles about the Head. We chew our food 

 for the most part with the help of two strong muscles, 



called the "chewing muscles" (masse- 



ter), which move the jaws. They are 



very large and strong in flesh-eating 



animals, like the lion and the tiger. 

 Turn the head suddenly to one side, 



and the sharp edge of a muscle is 



plainly seen and 



felt on each side of 



the neck : one end 



is fastened to the 



skull, the other to 



the breastbone and 



the collar bone. 



This muscle (sterno- 



cleido-mastoid) serves 



to turn and to brace 



the head. 



Inside the cheek 



is a flat muscle, called the "trumpeter's 

 muscle." It is largely developed in glass 

 blowers and in persons who play on wind 

 instruments. 



FIG. 40. Tendons on the 

 Back of the Left Hand. 



Experiment 19. With the head slightly bent 

 forward, grasp between the fingers and thumb 

 of the right hand the edge of a muscle on the FlG 

 left, just above the collar bone. Raise the head 

 and turn it from left to right, and the action of 

 this important muscle (sterno-cleido-mastoid) 



is readily seen and felt. In some persons, especially with those who 

 are lean or who have been seriously ill, this long, slender muscle 

 stands out in bold relief. 



Tendons on 

 the Top of the Right 

 Foot. 



